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https://github.com/mikepenz/FastAdapter

The bullet proof, fast and easy to use adapter library, which minimizes developing time to a fraction...
https://github.com/mikepenz/FastAdapter

adapter android android-development android-library android-ui click-listeners drag-and-drop fastadapter hacktoberfest kotlin kotlin-android mikepenz multi-select recyclerview recyclerview-adapter swipe viewholder

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The bullet proof, fast and easy to use adapter library, which minimizes developing time to a fraction...

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# FastAdapter



The FastAdapter is here to simplify creating adapters for RecyclerViews. Don't worry about the adapter anymore. Just write the logic for how your view/item should look like, and you are done.

It's blazing fast, minimizing the code you need to write, and is easy to extend.



-------





    What's included 🚀 •

    Setup 🛠️ •

    Migration Guide 🧬 •

    Used by •

    Sample App




-------



### What's included 🚀

- Core module 100% in Kotlin

- Click / Long-Click listeners

- Selection / Multi-Selection ([MultiselectSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/MultiselectSampleActivity.kt), [CheckBoxSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/CheckBoxSampleActivity.kt), [RadioButtonSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/RadioButtonSampleActivity.kt))

- Expandable items ([ExpandableSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/ExpandableSampleActivity.kt), [IconGridSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/IconGridActivity.kt) ,[AdvancedSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/AdvancedSampleActivity.kt))

- Write less code, get better results

- Highly optimized code

- Simple Drag & Drop ([SimpleItemListSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/SimpleItemListActivity.kt))

- Headers ([StickyHeaderSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/StickyHeaderSampleActivity.kt), [AdvancedSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/AdvancedSampleActivity.kt))

- Footers

- Filter ([SimpleItemListSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/SimpleItemListActivity.kt))

- Includes suggestions from the Android Team

- Easily extensible

- Endless Scroll ([EndlessScrollSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/EndlessScrollListActivity.kt))

- "Leave-Behind"-Pattern ([SwipeListSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/SwipeListActivity.kt))

- Split item view and model ([ModelItem](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/ModelItemActivity.kt), [MultiTypeModelItem](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/MultiTypeModelItemActivity.kt))

- Chain other Adapters ([SimpleItemListSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/SimpleItemListActivity.kt), [StickyHeaderSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/StickyHeaderSampleActivity.kt))

- Comes with useful Helpers

 - ActionModeHelper ([MultiselectSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/MultiselectSampleActivity.kt))

 - UndoHelper ([MultiselectSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/MultiselectSampleActivity.kt))

- FastScroller (external lib) ([SimpleItemListSample](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/SimpleItemListActivity.kt))

- Paging (via Jetpack paging lib) ([PagedActivity](https://github.com/mikepenz/FastAdapter/blob/develop/app/src/main/java/com/mikepenz/fastadapter/app/PagedActivity.kt))

 - More to come...



# Preview



## Screenshots 🎉

![Image](https://raw.githubusercontent.com/mikepenz/FastAdapter/develop/DEV/github/screenshots1.jpg)



# Setup



## Latest releases 🛠



- Kotlin | [v5.7.0](https://github.com/mikepenz/FastAdapter/tree/v5.7.0)

- [Deprecated] Java && AndroidX | [v3.3.1](https://github.com/mikepenz/FastAdapter/tree/v3.3.1)

- [Deprecated] Java && AppCompat | [v3.2.9](https://github.com/mikepenz/FastAdapter/tree/v3.2.9)



## Provide the gradle dependency



The library is split up into core, commons, and extensions. The core functions are included in the following dependency.

```gradle

implementation "com.mikepenz:fastadapter:${latestFastAdapterRelease}"

implementation "androidx.appcompat:appcompat:${androidX}"

implementation "androidx.recyclerview:recyclerview:${androidX}"

```



Expandable support is included and can be added via this

```gradle

implementation "com.mikepenz:fastadapter-extensions-expandable:${latestFastAdapterRelease}"

```



Many helper classes are included in the following dependency.

```gradle

implementation "com.mikepenz:fastadapter-extensions-binding:${latestFastAdapterRelease}" // view binding helpers

implementation "com.mikepenz:fastadapter-extensions-diff:${latestFastAdapterRelease}" // diff util helpers

implementation "com.mikepenz:fastadapter-extensions-drag:${latestFastAdapterRelease}" // drag support

implementation "com.mikepenz:fastadapter-extensions-paged:${latestFastAdapterRelease}" // paging support

implementation "com.mikepenz:fastadapter-extensions-scroll:${latestFastAdapterRelease}" // scroll helpers

implementation "com.mikepenz:fastadapter-extensions-swipe:${latestFastAdapterRelease}" // swipe support

implementation "com.mikepenz:fastadapter-extensions-ui:${latestFastAdapterRelease}" // pre-defined ui components

implementation "com.mikepenz:fastadapter-extensions-utils:${latestFastAdapterRelease}" // needs the `expandable`, `drag` and `scroll` extension.



// required for the ui components and the utils

implementation "com.google.android.material:material:${androidX}"

```



## How to use

### 1. Implement your item

#### 1a. Implement your item as usual (the easy way)

Just create a class which extends the `AbstractItem` as shown below. Implement the methods, and your item is ready.

```kotlin

open class SimpleItem : AbstractItem() {

    var name: String? = null

    var description: String? = null



    /** defines the type defining this item. must be unique. preferably an id */

    override val type: Int

        get() = R.id.fastadapter_sample_item_id



    /** defines the layout which will be used for this item in the list */

    override val layoutRes: Int

        get() = R.layout.sample_item



    override fun getViewHolder(v: View): ViewHolder {

        return ViewHolder(v)

    }



    class ViewHolder(view: View) : FastAdapter.ViewHolder(view) {

        var name: TextView = view.findViewById(R.id.material_drawer_name)

        var description: TextView = view.findViewById(R.id.material_drawer_description)



        override fun bindView(item: SimpleItem, payloads: List) {

            name.text = item.name

            description.text = item.name

        }



        override fun unbindView(item: SimpleItem) {

            name.text = null

            description.text = null

        }

    }

}



```



#### 1b. Implement item with ViewBinding (the easiest way)



```kotlin

class BindingIconItem : AbstractBindingItem() {

    var name: String? = null



    override val type: Int

        get() = R.id.fastadapter_icon_item_id



    override fun bindView(binding: IconItemBinding, payloads: List) {

        binding.name.text = name

    }



    override fun createBinding(inflater: LayoutInflater, parent: ViewGroup?): IconItemBinding {

        return IconItemBinding.inflate(inflater, parent, false)

    }

}

```

Use the `binding` extension dependency in your application for this.



### 2. Set the Adapter to the RecyclerView

```kotlin

//create the ItemAdapter holding your Items

val itemAdapter = ItemAdapter()

//create the managing FastAdapter, by passing in the itemAdapter

val fastAdapter = FastAdapter.with(itemAdapter)



//set our adapters to the RecyclerView

recyclerView.setAdapter(fastAdapter)



//set the items to your ItemAdapter

itemAdapter.add(ITEMS)

```



### 3. Extensions



By default the `FastAdapter` only provides basic functionality, which comes with the abstraction of items as `Item` and `Model`. 

And the general functionality of adding/removing/modifying elements. To enable *selections*, or *expandables* the provided extensions need to be activated.



#### 3.1. SelectExtension



```kotlin

// Gets (or creates and attaches if not yet existing) the extension from the given `FastAdapter`

val selectExtension = fastAdapter.getSelectExtension()

// configure as needed

selectExtension.isSelectable = true

selectExtension.multiSelect = true

selectExtension.selectOnLongClick = false

// see the API of this class for more options.

```



#### 3.2. ExpandableExtension



> This requires the `fastadapter-extensions-expandable` extension.



```kotlin

// Gets (or creates and attaches if not yet existing) the extension.

val expandableExtension = fastAdapter.getExpandableExtension()

// configure as needed

expandableExtension.isOnlyOneExpandedItem = true

```



For further details scroll down to the `ExpandableItems` (under advanced usage) section.



### 3. Click listener

```kotlin

fastAdapter.onClickListener = { view, adapter, item, position ->

    // Handle click here

    false

}

```



### 4. Click listeners for views inside your item

```kotlin

// just add an `EventHook` to your `FastAdapter` by implementing either a `ClickEventHook`, `LongClickEventHook`, `TouchEventHook`, `CustomEventHook`

fastAdapter.addEventHook(object : ClickEventHook() {

    override fun onBind(viewHolder: RecyclerView.ViewHolder): View? {

        //return the views on which you want to bind this event

        return if (viewHolder is SimpleImageItem.ViewHolder) {

            viewHolder.viewWhichReactsOnClick

        } else {

	    null

	}

    }



    override fun onClick(v: View, position: Int, fastAdapter: FastAdapter, item: SimpleImageItem) {

        //react on the click event

    }

})

```



### 5. Filter 



```kotlin

// Call this in onQueryTextSubmit() & onQueryTextChange() when using SearchView

itemAdapter.filter("yourSearchTerm")

itemAdapter.itemFilter.filterPredicate = { item: SimpleItem, constraint: CharSequence? ->

    item.name?.text.toString().contains(constraint.toString(), ignoreCase = true)

}

```

`filter()` should return true for items to be retained and false for items to be removed.



### 6. Drag and drop



> This requires the `fastadapter-extensions-drag` extension.



First, attach `ItemTouchHelper` to RecyclerView.



```kotlin

val dragCallback = SimpleDragCallback()

val touchHelper = ItemTouchHelper(dragCallback)

touchHelper.attachToRecyclerView(recyclerView)

```



Implement `ItemTouchCallback` interface in your Activity, and override the `itemTouchOnMove()` method.



```kotlin

override fun itemTouchOnMove(oldPosition: Int, newPosition: Int): Boolean {

    DragDropUtil.onMove(fastItemAdapter.itemAdapter, oldPosition, newPosition) // change position

    return true

}

```



### 7. Using different ViewHolders (like HeaderView)



Start by initializing your adapters:



```kotlin

// Header is a model class for your header

val headerAdapter = ItemAdapter()

```



Initialize a Model FastAdapter:



```kotlin

val itemAdapter = GenericItemAdapter()

```



Finally, set the adapter:



```kotlin

val fastAdapter: GenericFastAdapter = FastAdapter.with(headerAdapter, itemAdapter) //the order defines in which order the items will show up

// alternative the super type of both item adapters can be used. e.g.:

recyclerView.setAdapter(fastAdapter)

```



### 8. Infinite (endless) scrolling



Create a FooterAdapter. We need this to display a loading ProgressBar at the end of our list. (Don't forget to pass it into `FastAdapter.with(..)`)



```kotlin

val footerAdapter = ItemAdapter()

```

Keep in mind that ProgressItem is provided by FastAdapter’s extensions.

```kotlin

recyclerView.addOnScrollListener(object : EndlessRecyclerOnScrollListener(footerAdapter) {

     override fun onLoadMore(currentPage: Int) {

         footerAdapter.clear()

         footerAdapter.add(ProgressItem())

         

	 // Load your items here and add it to FastAdapter

         itemAdapter.add(NEWITEMS)

    }

})

```



For the complete tutorial and more features such as multi-select and CAB check out the [sample app](https://github.com/mikepenz/FastAdapter/tree/develop/app).



## Advanced Usage

### Proguard

* As of v2.5.0 there are no more known requirements to use the `FastAdapter` with Proguard



### ExpandableItems

The `FastAdapter` comes with support for expandable items. After adding the dependency set up the `Expandable` extension via:



```kotlin

val expandableExtension = fastAdapter.getExpandableExtension()

```



Expandable items have to implement the `IExpandable` interface, and the sub items the `ISubItem` interface. This allows better support.

The sample app provides sample implementations of those. (Those in the sample are kept Model which allows them to be used with different parent / subitems)



As of the way how `SubItems` and their state are handled it is highly recommended to use the `identifier` based `StateManagement`. Just add `withPositionBasedStateManagement(false)` to your `FastAdapter` setup.



A simple item just needs to extend from the `AbstractExpandableItem` and provide the `ViewHolder` as type.

```kotlin

open class SimpleSubExpandableItem : AbstractExpandableItem() {



    /**

     * BASIC ITEM IMPLEMENTATION

     */

}

```

// See the `SimpleSubExpandableItem.kt` of the sample application for more details.



## Articles

- [RecyclerView Adapter made easy](https://blog.iamsuleiman.com/recyclerview-adapter-android-made-fast-easy/) (FastAdapter v2.x)



## Used by

Mike Penz:

- AboutLibraries https://github.com/mikepenz/AboutLibraries

- Android-Iconics https://github.com/mikepenz/Android-Iconics

- ItemAnimators https://github.com/mikepenz/ItemAnimators

- MaterialDrawer https://github.com/mikepenz/MaterialDrawer



# Developed By



- Mike Penz

  - [mikepenz.dev](https://mikepenz.dev) - [blog.mikepenz.dev](https://blog.mikepenz.dev) - 

  - [paypal.me/mikepenz](http://paypal.me/mikepenz)

  - [Automatic changelog generation action](https://github.com/marketplace/actions/release-changelog-builder)



- Fabian Terhorst

  - [github.com/FabianTerhorst](https://github.com/FabianTerhorst) - 

  - [paypal.me/fabianterhorst](http://paypal.me/fabianterhorst)



# Contributors



This free, open source software was also made possible by a group of volunteers that put many hours of hard work into it. See the [CONTRIBUTORS.md](CONTRIBUTORS.md) file for details.



## Special mentions



A special thanks to the very active contributors who added many improvements to this library.



* **[Allan Wang](https://github.com/AllanWang)** 

* **[MFlisar](https://github.com/MFlisar)**

* **[RobbWatershed](https://github.com/RobbWatershed)**



# License



    Copyright 2021 Mike Penz



    Licensed under the Apache License, Version 2.0 (the "License");

    you may not use this file except in compliance with the License.

    You may obtain a copy of the License at



       http://www.apache.org/licenses/LICENSE-2.0



    Unless required by applicable law or agreed to in writing, software

    distributed under the License is distributed on an "AS IS" BASIS,

    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    See the License for the specific language governing permissions and

    limitations under the License.